6663780357696 has 1344 divisors, whose sum is σ = 25950233088000. Its totient is φ = 1615948185600.

The previous prime is 6663780357691. The next prime is 6663780357709. The reversal of 6663780357696 is 6967530873666.

It is a tau number, because it is divible by the number of its divisors (1344).

It is a Harshad number since it is a multiple of its sum of digits (72).

It is not an unprimeable number, because it can be changed into a prime (6663780357691) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 2931710416 + ... + 2931712688.

Almost surely, 2^{6663780357696} is an apocalyptic number.

6663780357696 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6663780357696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12975116544000).

6663780357696 is an abundant number, since it is smaller than the sum of its proper divisors (19286452730304).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6663780357696 is a wasteful number, since it uses less digits than its factorization.

6663780357696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2413 (or 2386 counting only the distinct ones).

The product of its (nonzero) digits is 1234517760, while the sum is 72.

The spelling of 6663780357696 in words is "six trillion, six hundred sixty-three billion, seven hundred eighty million, three hundred fifty-seven thousand, six hundred ninety-six".